Tuning guidelines for campus clusters
An important consideration while tuning an SF Oracle RAC campus cluster is setting the LLT peerinact time. Follow the guidelines below to determine the optimum value of peerinact time:
Calculate the roundtrip time using lltping (1M).
Evaluate LLT heartbeat time as half of the round trip time.
Set the LLT peer trouble time as 2-4 times the heartbeat time.
LLT peerinact time should be set to be more than 4 times the heart beat time.
